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This required changing the `MetricsMap` interface to provide a `DeleteAll()` method instead of a `Delete(key)` one: indeed `Delete()` was used inside the callback provided to `IterateWithCallback()`, and the new `IterateWithCallback()` implementation holds a read lock over the map for the entire iteration procedure, so calling `Delete()` in the callback would have caused a dead-lock. Signed-off-by: Leonardo Di Giovanna <leonardodigiovanna1@gmail.com>
`cilium_metrics` max_entries is set to `METRICS_MAP_SIZE`. The agent generates that macro from `metricsmap.MaxEntries` (1024), so the datapath map has been created with 1024 entries at runtime since 321b147 ("metricsmap: reduce MaxEntries to account for maximum key space"). Only the static value in `bpf/node_config.h` was left at 65536. That value is the one used by static builds (e.g. the BPF tests) and baked into `maps_generated.go`, which the map registry uses as the base spec of the map. Set the static value to 1024 and regenerate `maps_generated.go`, so that the static definition matches the one used at runtime. No functional change for the agent. Signed-off-by: Leonardo Di Giovanna <leonardodigiovanna1@gmail.com>
This lets us get rid of the corresponding `METRICS_MAP_SIZE` C macro that used to represent the number of max entries for `cilium_metrics`. Map flags are configured by leveraging the `MapRegistry.Modify()` API, while the number of max entries is left untouched, as the base map spec (baked into `maps_generated.go`, and generated from map's datapath definition) already stores the right value (1024). Signed-off-by: Leonardo Di Giovanna <leonardodigiovanna1@gmail.com>
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This lets us get rid of the corresponding
METRICS_MAP_SIZEC macro that used to represent the number of max entries forcilium_metrics.Map flags are configured by leveraging the
MapRegistry.Modify()API, while the number of max entries is left untouched, as the base map spec (baked intomaps_generated.go, and generated from map's datapath definition) already stores the right value (1024).Notice that the
metricsMaptype now embeds a*bpf.Mapinstead of*ebpf.Map.Finally, notice that the original static value for
METRICS_MAP_SIZEwas 65536, but the agent has always set it to 1024 at runtime (seemetricsmap.MaxEntries) ignoring the stale static value (that value became stale after 321b147cba33 got merged). For this reason, I changed the map definition to use 1024 instead of 65536.Related: #48853
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